/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.datasource.api.client;

import org.apache.dolphinscheduler.plugin.datasource.api.provider.JDBCDataSourceProvider;
import org.apache.dolphinscheduler.spi.datasource.BaseConnectionParam;
import org.apache.dolphinscheduler.spi.datasource.DataSourceClient;
import org.apache.dolphinscheduler.spi.enums.DbType;

import org.apache.commons.lang3.StringUtils;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.core.JdbcTemplate;

import com.google.common.base.Stopwatch;
import com.zaxxer.hikari.HikariDataSource;

public class CommonDataSourceClient implements DataSourceClient {

  private static final Logger logger = LoggerFactory.getLogger(CommonDataSourceClient.class);

  public static final String COMMON_USER = "root";
  public static final String COMMON_VALIDATION_QUERY = "select 1";

  protected final BaseConnectionParam baseConnectionParam;
  protected HikariDataSource dataSource;
  protected JdbcTemplate jdbcTemplate;

  public CommonDataSourceClient(BaseConnectionParam baseConnectionParam, DbType dbType) {
    this.baseConnectionParam = baseConnectionParam;
    preInit();
    checkEnv(baseConnectionParam);
    initClient(baseConnectionParam, dbType);
    checkClient();
  }

  protected void preInit() {
    logger.info("preInit in CommonDataSourceClient");
  }

  protected void checkEnv(BaseConnectionParam baseConnectionParam) {
    checkValidationQuery(baseConnectionParam);
    checkUser(baseConnectionParam);
  }

  protected void initClient(BaseConnectionParam baseConnectionParam, DbType dbType) {
    this.dataSource = JDBCDataSourceProvider.createJdbcDataSource(baseConnectionParam, dbType);
    this.jdbcTemplate = new JdbcTemplate(dataSource);
  }

  protected void checkUser(BaseConnectionParam baseConnectionParam) {
    if (StringUtils.isBlank(baseConnectionParam.getUser())) {
      setDefaultUsername(baseConnectionParam);
    }
  }

  protected void setDefaultUsername(BaseConnectionParam baseConnectionParam) {
    baseConnectionParam.setUser(COMMON_USER);
  }

  protected void checkValidationQuery(BaseConnectionParam baseConnectionParam) {
    if (StringUtils.isBlank(baseConnectionParam.getValidationQuery())) {
      setDefaultValidationQuery(baseConnectionParam);
    }
  }

  protected void setDefaultValidationQuery(BaseConnectionParam baseConnectionParam) {
    baseConnectionParam.setValidationQuery(COMMON_VALIDATION_QUERY);
  }

  @Override
  public void checkClient() {
    //Checking data source client
    Stopwatch stopwatch = Stopwatch.createStarted();
    try {
      this.jdbcTemplate.execute(this.baseConnectionParam.getValidationQuery());
    } catch (Exception e) {
      throw new RuntimeException("JDBC connect failed", e);
    } finally {
      logger.info("Time to execute check jdbc client with sql {} for {} ms ", this.baseConnectionParam.getValidationQuery(), stopwatch.elapsed(TimeUnit.MILLISECONDS));
    }
  }

  @Override
  public Connection getConnection() {
    try {
      return this.dataSource.getConnection();
    } catch (SQLException e) {
      logger.error("get druidDataSource Connection fail SQLException: {}", e.getMessage(), e);
      return null;
    }
  }

  @Override
  public void close() {
    logger.info("do close dataSource {}.", baseConnectionParam.getDatabase());
    try (HikariDataSource closedDatasource = dataSource) {
      // only close the resource
    }
    this.jdbcTemplate = null;
  }

}
